Integrated spatial analysis of gene mutation and gene expression for understanding tumor diversity in formalin-fixed paraffin-embedded lung adenocarcinoma

Miki Yamazaki, Masahito Hosokawa, Hiroko Matsunaga, Koji Arikawa, Kazuya Takamochi, Kenji Suzuki, Takuo Hayashi, Hideki Kambara, Haruko Takeyama*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Introduction: A deeper understanding of intratumoral heterogeneity is essential for prognosis prediction or accurate treatment plan decisions in clinical practice. However, due to the cross-links and degradation of biomolecules within formalin-fixed paraffin-embedded (FFPE) specimens, it is challenging to analyze them. In this study, we aimed to optimize the simultaneous extraction of mRNA and DNA from microdissected FFPE tissues (φ = 100 µm) and apply the method to analyze tumor diversity in lung adenocarcinoma before and after erlotinib administration. Method: Two magnetic beads were used for the simultaneous extraction of mRNA and DNA. The decross-linking conditions were evaluated for gene mutation and gene expression analyses of microdissected FFPE tissues. Lung lymph nodes before treatment and lung adenocarcinoma after erlotinib administration were collected from the same patient and were preserved as FFPE specimens for 4 years. Gene expression and gene mutations between histologically classified regions of lung adenocarcinoma (pre-treatment tumor in lung lymph node biopsies and post-treatment tumor, normal lung, tumor stroma, and remission stroma, in resected lung tissue) were compared in a microdissection-based approach. Results: Using the optimized simultaneous extraction of DNA and mRNA and whole-genome amplification, we detected approximately 4,000–10,000 expressed genes and the epidermal growth factor receptor (EGFR) driver gene mutations from microdissected FFPE tissues. We found the differences in the highly expressed cancer-associated genes and the positive rate of EGFR exon 19 deletions among the tumor before and after treatment and tumor stroma, even though they were collected from tumors of the same patient or close regions of the same specimen. Conclusion: Our integrated spatial analysis method would be applied to various FFPE pathology specimens providing area-specific gene expression and gene mutation information.

Original languageEnglish
Article number936190
JournalFrontiers in Oncology
Volume12
DOIs
Publication statusPublished - 2022 Nov 24

Keywords

  • cancer therapy
  • drug resistance
  • formalin-fixed paraffin-embedded specimens
  • intratumoral heterogeneity (ITH)
  • non-small cell lung cancer (NSCLC)
  • spatial transcriptome
  • tumor microenvironment
  • tyrosine-kinase inhibitors (TKIs)

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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